diff --git a/Chart-gtk.cabal b/Chart-gtk.cabal
--- a/Chart-gtk.cabal
+++ b/Chart-gtk.cabal
@@ -1,5 +1,5 @@
 Name: Chart-gtk
-Version: 1.8
+Version: 1.8.1
 License: BSD3
 License-file: LICENSE
 Copyright: Tim Docker, 2006-2014
@@ -21,8 +21,8 @@
                , colour >= 2.2.1 && < 2.4
                , colour >= 2.2.1
                , gtk >= 0.9.11
-               , Chart >= 1.8 && < 1.9
-               , Chart-cairo >= 1.8 && < 1.9
+               , Chart >= 1.8.1 && < 1.9
+               , Chart-cairo >= 1.8.1 && < 1.9
 
   Exposed-modules:
         Graphics.Rendering.Chart.Gtk
diff --git a/Graphics/Rendering/Chart/Gtk.hs b/Graphics/Rendering/Chart/Gtk.hs
--- a/Graphics/Rendering/Chart/Gtk.hs
+++ b/Graphics/Rendering/Chart/Gtk.hs
@@ -54,7 +54,7 @@
 -- | Display a renderable in a gtk window.
 --
 -- Note that this is a convenience function that initialises GTK on
--- it's first call, but not subsequent calls. Hence it's 
+-- its first call, but not subsequent calls. Hence it's 
 -- unlikely to be compatible with other code using gtk. In 
 -- that case use createRenderableWindow.
 renderableToWindow :: Renderable a -> Int -> Int -> IO ()